You have 80 pieces of fabric to make a wall hanging. each piece of fabric is a square with a side length of 5 inches. you use as many pieces of fabric as possible to create a square wall hanging. what is the area of the wall hanging? how many pieces of fabric are left over? how many more pieces of fabric would you need to increase the size of the wall hanging?

Okay. fist off don't think of them as 5 units each, but 1. so if you were to put it on graphing paper and box squares each time. you would be able to get 8 in for both sides to make a square. Area then would be 1600ft squared because 8 ×5 is 40 and 40×40 is 1600. then you calculate how many squares you used. 8×8=64. and 80-64=16 so 16 pieces are left over. then 9×9 (increasing the square) is 81. so 17 pieces to increase it.

The right answer is option d.